compressor

Abstract

A compressor is disclosed, comprising: a housing; a first scroll member and a second scroll member located within the housing, the first scroll member having a first end plate and a first scroll extending from the first end plate toward the second scroll member, the second scroll member having a second end plate and a second scroll extending from the second end plate toward the first scroll member, the second scroll engaging with the first scroll to define a compression cavity between the second scroll and the first scroll, the second end plate of the second scroll member further having a mounting hub extending in a direction away from the first scroll member; a drive mechanism located within the housing on the side of the second scroll member away from the first scroll member, for driving the first scroll member to rotate around a first rotation center, and the first scroll member driving the second scroll member to rotate around a second rotation center; and a shaft located within the housing and fixedly mounted in the compressor, one end of the shaft having a first hole, wherein the mounting hub is received in the first hole.

Description

Technical Field

[0001] This invention relates to a compressor, and more specifically, to a compressor with high reliability and high performance. Background Technology

[0002] In common-rotation compressors, strict workpiece machining dimensions and assembly processes are usually used to ensure the seal between the scrolls. Due to the limitations of the process level, this results in high manufacturing costs and large leakage of scroll compressors, as well as low compressor efficiency. Summary of the Invention

[0003] The embodiments of the present invention are used to solve one or more of the above-mentioned technical problems.

[0004] According to one aspect of the present invention, a compressor is provided, comprising: a housing; a first scroll member and a second scroll member located within the housing, the first scroll member having a first end plate and a first scroll extending from the first end plate toward the second scroll member, the second scroll member having a second end plate and a second scroll extending from the second end plate toward the first scroll member, the second scroll engaging with the first scroll to define a compression cavity between the second scroll and the first scroll, the second end plate of the second scroll member further having a mounting hub extending in a direction away from the first scroll member; a drive mechanism located within the housing on the side of the second scroll member away from the first scroll member, for driving the first scroll member to rotate around a first rotation center, and the first scroll member driving the second scroll member to rotate around a second rotation center; and a shaft located within the housing and fixedly mounted in the compressor, one end of the shaft having a first hole, wherein the mounting hub is received in the first hole.

[0005] According to one aspect of the invention, the compressor further includes a first sleeve, which is received in a first hole and is used to receive a mounting hub.

[0006] According to one aspect of the invention, the compressor further includes a first bearing disposed between the first sleeve and the mounting hub, wherein the outer diameter of the first sleeve is smaller than the inner diameter of the first hole.

[0007] According to one aspect of the invention, the shaft is further provided with a second hole located in the side wall of the first hole and communicating with the first hole; a driving part is provided radially on the outer wall of the first sleeve; the second hole is engaged with the driving part.

[0008] According to one aspect of the invention, the compressor further includes a pin received in a second hole; and a drive portion of the first sleeve is a drive surface for abutting against the pin.

[0009] According to one aspect of the invention, the driving portion of the first sleeve is a protrusion that extends radially outward along the first sleeve to engage with the second hole.

[0010] According to one aspect of the invention, the driving surface is flat or has a curved shape.

[0011] According to one aspect of the invention, the rotation center of the first scroll member and the rotation center of the second scroll member do not coincide in the axial direction.

[0012] According to one aspect of the invention, the shaft is further provided with a channel in fluid communication with the first hole for receiving the pump rod and conveying the oil pumped by the pump rod, one end of the pump rod being located in an oil sump at the bottom of the housing, and the other end of the pump rod being connected to a mounting hub, wherein the cross-section of the channel has an inner diameter smaller than the inner diameter of the first hole.

[0013] According to one aspect of the invention, the first geometric center corresponding to the outer diameter of the sidewall of the first hole coincides axially with the rotation center of the first vortex member, and the second geometric center corresponding to the inner diameter of the cross section of the channel coincides axially with the rotation center of the second vortex member.

[0014] According to one aspect of the invention, the circumferential position of the second hole along the sidewall of the axis is defined by the angle between the line connecting the second hole and the second geometric center and the line connecting the first geometric center and the second geometric center.

[0015] According to one aspect of the invention, the shaft is further provided with a third hole extending axially from the top of the sidewall to the oil reservoir in the sidewall of the shaft, and a fourth hole extending radially from the first hole to the outside of the sidewall in the sidewall of the shaft.

[0016] According to one aspect of the invention, the compressor further includes: a bracket fixedly mounted on the housing on the side of the second scroll member away from the first scroll member; wherein the shaft is fixedly mounted on the bracket.

[0017] According to one aspect of the invention, the drive mechanism includes: a receiving hub, the receiving hub including opposing first end and second end and rotatably mounted on a shaft such that the drive mechanism is rotatably mounted on a bracket; and a first flange extending radially outward from the first end, the drive mechanism having an inner hole extending through the receiving hub and the first flange and connected to a first scroll member through the first flange, the second end plate of the second scroll member being rotatably supported on the first flange.

[0018] According to one aspect of the invention, the compressor further includes: a second bearing, the first end of which is mounted on the shaft via the second bearing; and a third bearing, the second end of which is mounted on the shaft via the third bearing.

[0019] According to one aspect of the invention, the shaft has a first stepped portion, and the bore wall of the inner bore receiving the hub has a second stepped portion facing the first stepped portion. The scroll compressor further includes a fourth bearing disposed between the first stepped portion and the second stepped portion.

[0020] According to one aspect of the invention, the support includes: a second sleeve, and a second flange extending radially from the second sleeve of the support, with a second end supported on the second flange of the support.

[0021] According to one aspect of the invention, the shaft is received within the receiving hub such that one end of the shaft having the first hole is flush with the upper surface of the first flange and the other end of the shaft extends out of the receiving hub to be inserted into and fixed in the second sleeve of the bracket.

[0022] According to one aspect of the invention, the compressor further includes an electric motor, comprising a rotor and a stator fixed to a support, wherein the rotor is interference-fitted to a receiving hub of a drive mechanism to drive the first scroll member to rotate by driving the drive mechanism.

[0023] According to one aspect of the invention, the compressor further includes: a bushing located between the side wall of the inner hole of the first flange and the outer wall of the first hole of the shaft, wherein a second bearing is disposed on the inner side of the bushing.

[0024] According to one aspect of the invention, the bushing comprises: a cylindrical body, and

[0025] A fixing part is provided on the outer peripheral surface of the cylindrical body for engaging with the side wall of the inner hole of the first flange.

[0026] According to one aspect of the invention, the electric motor is an axial flux motor.

[0027] According to one aspect of the invention, the first sleeve is composed of at least one of sintered material, metallic material and composite material.

[0028] According to one aspect of the invention, the Rockwell hardness of the first sleeve is greater than or equal to 15.

[0029] According to one aspect of the invention, the bushing has a Rockwell hardness of 15 or greater. Attached Figure Description

[0030] Preferred embodiments of the invention will now be described by way of example with reference to the accompanying drawings, in which:

[0031] Figure 1 This is a cross-sectional view of a compressor according to an embodiment of the present invention.

[0032] Figure 2 yes Figure 1 A partially exploded view of the compressor is shown.

[0033] Figure 3 yes Figure 2 An enlarged view of a portion of the compressor.

[0034] Figure 4 This is according to an embodiment of the present invention. Figure 2 Top view of the axis in the diagram.

[0035] Figure 5 This is according to an embodiment of the present invention. Figure 2 A cross-sectional view of the shaft in the diagram.

[0036] Figure 6 According to one embodiment of the present invention, a pin, a first sleeve, and a first bearing are mounted. Figure 2 A cross-sectional view of the shaft in the diagram.

[0037] Figure 7 This is a perspective view of a shaft according to another embodiment of the present invention.

[0038] Figure 8 This is a perspective view of a shaft according to yet another embodiment of the present invention. Detailed Implementation

[0039] The technical solution of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. In this specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention and should not be construed as a limitation thereof.

[0040] Furthermore, in the following detailed description, numerous specific details are set forth for ease of explanation to provide a thorough understanding of the embodiments disclosed herein. However, it will be apparent that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and apparatuses are illustrated to simplify the figures.

[0041] See Figures 1 to 8 A compressor 1000 is provided, comprising: a housing 200, a first scroll member 10 and a second scroll member 20 located within the housing 200, a drive mechanism 100, an electric motor 90, a shaft 40, and a bracket 80.

[0042] The first scroll member 10 has a first end plate 11 and a first scroll 12 extending from the first end plate 11 toward the second scroll member 20. The second scroll member 20 has a second end plate 21 and a second scroll 22 extending from the second end plate 21 toward the first scroll member 10. The second scroll 22 engages with the first scroll 12 to define a compression chamber 30 between the second scroll 22 and the first scroll 12. The compression chamber 30 is used to compress fluid entering the compression chamber 30 when relative rotation occurs between the first scroll member 10 and the second scroll member 20. The second end plate 21 of the second scroll member 20 also has a mounting hub 23 extending in a direction away from the first scroll member 10.

[0043] The bracket 80 is fixedly mounted on the housing 200 on the side of the second scroll member 20 away from the first scroll member 10. The shaft 40 is fixedly mounted on the bracket 80 in the compressor 1000. One end of the shaft 40 is provided with a first hole 41, and the mounting hub 23 is accommodated in the first hole 41 with a clearance fit, thereby allowing the second scroll member 20 to move radially during rotation. When the compressor is running, the force of the gas acting on the second scroll member through the pin is decomposed into a radial force that makes the scroll walls fit together and a tangential force that generates tangential torque by the angle α between BB and O1-O2. Due to the existence of the clearance fit and the radial force obtained by the force decomposition, the scroll wall of the second scroll member can continuously fit against the scroll wall of the first scroll member, thereby ensuring good sealing performance. At the same time, this also avoids the second scroll member 20 from abutting against the shaft 40 and bearing large stress for a long time when impurities enter the scroll compression chamber, and thus avoids the resulting breakage or damage. This is beneficial to improving the efficiency and reliability of the compressor 1000.

[0044] The drive mechanism 100 is located on the side of the second scroll member 20 away from the first scroll member 10, and is used to drive the first scroll member 10 to rotate along a first rotation center, and the first scroll member 10 drives the second scroll member 20 to rotate along a second rotation center. The drive mechanism 100 includes a receiving hub portion 102 and a first flange portion 101. The receiving hub portion 102 includes opposing first and second ends and is rotatably mounted on a shaft 40 so that the drive mechanism 100 is rotatably mounted on a bracket 80. The first flange portion 101 extends radially outward from the first end. The drive mechanism 100 is provided with an inner hole extending through the receiving hub portion 102 and the first flange portion 101 and is connected to the first scroll member 10 through the first flange portion 101. The second end plate 21 of the second scroll member 20 is rotatably supported on the first flange portion 101.

[0045] In this embodiment, the motor 90 is an axial flux motor, but it can also be any other suitable type of motor. The motor 90 includes a rotor 91 and a stator 92 fixed to the bracket 80, and the rotor 91 is interference-fitted to the receiving hub 102 of the drive mechanism 100 to drive the first scroll member 10 to rotate by driving the drive mechanism 100.

[0046] A first sleeve 50 is accommodated in a first bore 41 for receiving a mounting hub 23 in a clearance fit. The first sleeve 50 is made of at least one of sintered materials, metallic materials, and composite materials, such that the first sleeve 50 has a Rockwell hardness greater than or equal to 15 and good wear resistance. The outer diameter of the first sleeve 50 is smaller than the inner diameter R1 of the first bore 41 to allow radial wobble of the second scroll member 20 during rotation. A first bearing 70 (i.e., a rolling bearing) is disposed between the first sleeve 50 and the mounting hub 23. A first end of the receiving hub 102 is mounted on the shaft 40 via a second bearing 121, and a second end of the receiving hub 102 is mounted on the shaft 40 via a third bearing 300 (see [link to relevant documentation]). Figure 1 ).

[0047] The bushing 120 is located between the side wall of the inner hole of the first flange portion 101 and the outer wall of the first hole 41 of the shaft 40, and a second bearing 121 is provided inside the bushing 120. The bushing 120 is made of cast iron, strong metal, steel, other alloys or other polymer materials, so that the bushing 120 has a Rockwell hardness greater than or equal to 15 and has good wear resistance. The bushing 120 includes a cylindrical body 122 and a fixing part 123 provided on the outer peripheral surface of the cylindrical body 122 for mating and connecting with the side wall of the inner hole of the first flange portion 101. Figure 2 In the figure, the fixing part 123 is shown as a plurality of protrusions spaced apart from each other along the outer peripheral surface of the cylindrical body 122. However, this is not limiting. The fixing part 123 may also be provided as a recess to engage with the sidewall of the inner hole of the first flange part 101.

[0048] The bracket 80 includes: a second sleeve 81, and a second flange portion 82 extending radially from the second sleeve 81 of the bracket 80, with a second end supported on the second flange portion 82 of the bracket 80 (see [link]). Figure 1 ).

[0049] See Figure 1 The shaft 40 is housed within the receiving hub 102, such that one end 45 of the shaft 40, which has the first hole 41, is flush with the upper surface of the first flange 101, and the other end 46 of the shaft 40 extends out of the receiving hub 102 to be inserted into and fixed in the second sleeve 81 of the bracket 80. This other end 46 can be fitted with an interference fit (see...). Figure 7 ) or threaded connection (see Figure 8 It is fixed to the second sleeve 81 in the manner of )

[0050] Shaft 40 is also provided with a second hole 42 located in the side wall 411 of the first hole 41 and communicating with the first hole 41. The outer wall of the first sleeve 50 is provided with a driving part 51 radially. The second hole 42 is engaged with the driving part 51. See Figures 3 to 6 Pin 60 is accommodated in the second hole 42. (Example) Figure 3As shown, the driving part 51 of the first sleeve 50 is a driving surface, which is flat or has a curved shape, to abut against the pin 60, so that the first sleeve 50 can only translate and cannot rotate. This also facilitates the transmission of the force of the fluid (here, gas) within the compressor 1000 through the pin 60 and the first sleeve 50 to the shaft 40 to mount the pin 60 in the second hole 42. The number of second holes 42 can be one (see...). Figures 3 to 6 ) or more (e.g., two, see Figure 7 and 8 That is, a desired number of second holes 42 can be set as needed to use one or more pins 60 to act on the first sleeve 50.

[0051] In another exemplary embodiment, the drive portion 51 of the first sleeve 50 may be configured to extend radially outward along the first sleeve 50 to engage with the protrusion in the second hole 42.

[0052] The rotation center of the first scroll member 10 and the rotation center of the second scroll member 20 do not coincide axially. That is, the rotation axis extending axially through the rotation center of the first scroll member 10 and the rotation axis extending axially through the rotation center of the second scroll member 20 are parallel to each other and spaced apart, as shown in the following text. Figure 4 As described. This is beneficial for the first scroll 10 and the second scroll 20 to balance the centrifugal force generated by each other during rotation, thereby avoiding the need to set up a balance block to balance the centrifugal force generated by the rotation of scrolls 10 and 20, simplifying the structure of compressor 1000 and reducing the volume of compressor 1000.

[0053] Shaft 40 is also provided with a channel 43 in fluid communication with the first hole 41 for accommodating the pump rod 431 and conveying the oil pumped by the pump rod 431. One end of the pump rod 431 is located in the oil sump at the bottom of the housing 200, and the other end of the pump rod 431 is connected to the mounting hub 23 (see...). Figure 1 The cross-section of channel 43 has an inner diameter R2 that is smaller than the inner diameter R1 of the first hole 41. See also Figure 4 To more clearly show the geometric centers O1 and O2, in Figure 4 The intersection of dashed lines AA and BB is defined as O1, and the intersection of dashed lines AA and CC is defined as O2. The first geometric center O1 corresponding to the outer diameter R3 of the sidewall 411 of the first hole 41 coincides axially with the rotation center of the first vortex member 10, and the second geometric center O2 corresponding to the inner diameter of the cross section of the channel 43 coincides axially with the rotation center of the second vortex member 20. Figure 4As can be seen, the geometric center O1 of the outer periphery of shaft 40 and the geometric center O2 of channel 43 located within shaft 40 are offset from each other. This structurally ensures the offset between the rotation centers of the first scroll member 10 and the second scroll member 20. See further details. Figure 4 Channel 43 and the first hole 41 have the same geometric center O2.

[0054] For ease of description, the circumferential position of the second hole 42 along the side wall 411 of the shaft 40 is defined by the angle α between the line connecting the second hole 42 and the second geometric center O2 and the line connecting the first geometric center O1 and the second geometric center O2, which is in the range of 0° to 360°. During compression, the pressure of the gas acts on the scroll members 10 and 20, causing the mounting hub 23 of the second scroll member 20 to indirectly abut against the pin 60 in the second hole 42 via the first sleeve 50. The pin 60 exerts a reaction force on the mounting hub 23 and the second scroll member 20 through the first sleeve 50, thereby improving the sealing between the scroll members 10 and 20. The size of the angle α determines the radial and tangential components of the force exerted by the pin 60 on the mounting hub 23. During design, the radial and tangential components of the force exerted by the pin 60 are adjusted by regulating the angle α, thereby optimizing the sealing between the scroll members 10 and 20.

[0055] The shaft 40 is also provided with a third hole 44 located in the side wall 411 of the first hole 41 and in fluid communication with the channel 43. The third hole 44 extends axially from the top of the side wall 411 to the oil sump in the side wall 411 of the shaft, so that excess oil pumped by the pump rod 431 in the channel 43 or oil that has lubricated other parts returns to the oil sump at the bottom of the housing 200 through the third hole 44. The shaft 40 is also provided with a fourth hole 48 extending radially from the first hole 41 to the outside of the side wall 411 of the shaft 40. A portion of the oil pumped by the pump rod 431 flows out from the fourth hole 48 to lubricate the relevant parts of the compressor 1000.

[0056] The shaft 40 has a first stepped portion 47, and the inner wall of the bore that accommodates the hub portion 102 has a second stepped portion 211 facing the first stepped portion 47. The fourth bearing 400 (i.e., a thrust bearing) is disposed between the first stepped portion 47 and the second stepped portion 211.

[0057] See Figure 1 In this embodiment, bearings 70, 121, 300, and 400 are all located on the side of the second scroll member 20 away from the first scroll member 10, which simplifies and optimizes the structure of the compressor 1000.

[0058] Those skilled in the art will understand that the embodiments described above are exemplary and can be improved upon. The structures described in the various embodiments can be freely combined without causing any conflict in structure or principle.

[0059] After a detailed description of the preferred embodiments of the present invention, those skilled in the art will clearly understand that various changes and modifications can be made without departing from the scope and spirit of the appended claims, and that the present invention is not limited to the embodiments described in the specification.

Claims

1. A compressor, comprising: case; A first scroll member and a second scroll member are located within the housing. The first scroll member has a first end plate and a first scroll extending from the first end plate toward the second scroll member. The second scroll member has a second end plate and a second scroll extending from the second end plate toward the first scroll member. The second scroll member engages with the first scroll member to define a compression cavity between the second scroll member and the first scroll member. The second end plate of the second scroll member also has a mounting hub extending in a direction away from the first scroll member. A drive mechanism is located within the housing on the side of the second scroll member away from the first scroll member, for driving the first scroll member to rotate along the first rotation center, and the first scroll member driving the second scroll member to rotate along the second rotation center. A shaft is located inside the housing and fixedly mounted in the compressor. A first hole is provided at the upper end of the shaft, wherein the mounting hub is accommodated in the first hole. and A first sleeve is received in the first hole and is used to receive the mounting hub. The shaft is also provided with a second hole located in the side wall of the first hole and communicating with the first hole; The outer wall of the first sleeve is provided with a driving part in the radial direction; The second hole is connected to the drive unit.

2. The compressor according to claim 1, further comprising: A first bearing is disposed between the first sleeve and the mounting hub, wherein the outer diameter of the first sleeve is smaller than the inner diameter of the first hole.

3. The compressor according to claim 1, further comprising: The pin is accommodated in the second hole; and the driving part of the first sleeve is a driving surface for abutting against the pin.

4. The compressor according to claim 1, wherein, The driving part of the first sleeve extends radially outward along the first sleeve to engage with the protrusion in the second hole.

5. The compressor according to claim 3, wherein, The driving surface is flat or has a curved shape.

6. The compressor according to any one of claims 1 to 5, wherein, The rotation center of the first scroll component and the rotation center of the second scroll component do not coincide in the axial direction.

7. The compressor according to claim 6, wherein, The shaft is also provided with a channel in fluid communication with the first hole for accommodating the pump rod and conveying the oil pumped by the pump rod. One end of the pump rod is located in the oil sump at the bottom of the housing, and the other end of the pump rod is connected to the mounting hub. The cross-section of the channel has an inner diameter smaller than the inner diameter of the first hole.

8. The compressor according to claim 7, wherein, The first geometric center corresponding to the outer diameter of the sidewall of the first hole coincides axially with the rotation center of the first vortex component, and the second geometric center corresponding to the inner diameter of the channel section coincides axially with the rotation center of the second vortex component.

9. The compressor according to claim 8, wherein, The circumferential position of the second hole along the sidewall of the axis is defined by the angle between the line connecting the second hole and the second geometric center and the line connecting the first geometric center and the second geometric center.

10. The compressor according to claim 7 or 8, wherein, The shaft is also provided with a third hole extending axially from the top of the sidewall to the oil reservoir in the sidewall of the shaft, and a fourth hole extending radially from the first hole to the outside of the sidewall in the sidewall of the shaft.

11. The compressor according to any one of claims 1 to 5 and 7 to 9, further comprising: A bracket is fixedly mounted on the housing on the side of the second vortex member away from the first vortex member; wherein the shaft is fixedly mounted on the bracket.

12. The compressor according to claim 11, wherein: The drive mechanism includes: a receiving hub, the receiving hub having opposing first and second ends and being rotatably mounted on the shaft such that the drive mechanism is rotatably mounted on the bracket; and a first flange extending radially outward from the first end, the drive mechanism having an inner hole extending through the receiving hub and the first flange and being connected to a first scroll member through the first flange, the second end plate of the second scroll member being rotatably supported on the first flange.

13. The compressor according to claim 12, further comprising: A second bearing is provided, and the first end is mounted on the shaft via the second bearing. as well as The second end is mounted on the shaft via a third bearing.

14. The compressor according to claim 12, wherein: The shaft has a first stepped portion. The inner wall of the accommodating hub has a second stepped portion facing the first stepped portion. The compressor also includes a fourth bearing, which is disposed between the first step and the second step.

15. The compressor according to claim 12, wherein: The bracket includes: a second sleeve, and a second flange extending radially from the second sleeve of the bracket, the second end being supported on the second flange of the bracket.

16. The compressor according to claim 15, wherein: The shaft is housed within the receiving hub such that one end of the shaft with the first hole is flush with the upper surface of the first flange and the other end of the shaft extends out of the receiving hub to be inserted into and fixed in the second sleeve of the bracket.

17. The compressor according to claim 12, further comprising: The electric motor includes a rotor and a stator fixed to the bracket, and the rotor is interference-fitted to a receiving hub of the drive mechanism to drive the first scroll member to rotate by driving the drive mechanism.

18. The compressor according to claim 13, further comprising: A bushing is located between the side wall of the inner hole of the first flange and the outer wall of the first hole of the shaft, and the second bearing is provided on the inner side of the bushing.

19. The compressor of claim 18, wherein the bushing comprises: Cylindrical body, and A fixing part is provided on the outer peripheral surface of the cylindrical body for engaging with the side wall of the inner hole of the first flange.

20. The compressor according to claim 17, wherein, The electric motor is an axial flux motor.

21. The compressor according to any one of claims 1 to 5, 7 to 9, wherein, The first sleeve is made of at least one of sintered material, metallic material and composite material.

22. The compressor according to any one of claims 1 to 5, 7 to 9, wherein, The Rockwell hardness of the first sleeve is greater than or equal to 15.

23. The compressor according to claim 18 or 19, wherein, The bushing has a Rockwell hardness of 15 or greater.

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